package collection;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class ListDemo {
    public static void main(String[] args) {

        List<String> list =new ArrayList<>();
        list.add("one");
        list.add("two");
        list.add("three");
        list.add("four");
        list.add("five");
        list.add("one");
        System.out.println(list);
        String e=list.get(4);
        System.out.println(e);
        //1
        for(int i=0;i<list.size();i++){
            System.out.println(list.get(i));
        }
        //2
        Iterator<String> it=list.iterator();
        while(it.hasNext()) {
            System.out.println(it.next());
        }
        //3
        for(String s:list){
            System.out.println(s);
        }
        System.out.println("------------------");

        String old=list.set(0,"nine");//返回被替掉的元素
        System.out.println("list:"+list);
        System.out.println(old);

        String older= list.remove(2);//返回被删掉的元素
        System.out.println("list:"+list);
        System.out.println(older);

        list.add(1,"six");
        System.out.println("list:"+list);


    }
}
